5 4 3 2 1 REVISION HISTORY ECO VIN 5V - 55V (3.5V Min) DESCRIPTION DATE APPROVED 3 PROD 04/17/12 DAVID B. VIN E1 R7 + D GND REV E2 CIN1 10uF 63V CIN3 2.2uF 100V 1210 (OPT) 0.025 2010 CIN2 2.2uF 100V 1210 U1 E3 CLKIN 2 BURST CLKIN 4 1 6 5 SKIP R6 LTC3864EMSE MODE 3 1 R1 JP2 2 0 Ohm 3 E4 TRACK PLL/MODE 0 Ohm GATE FREQ VIN GND SENSE 12 SS CAP VFB RUN 10 E9 L1 10uH 0.1uF 100V 0805 XAL5050-103ME COILCRAFT D1 SBR3U100LP-7 D2 PDS5100-13 PowerDi5 (OPT) 9 E5 COUT1 100uF 6.3V 1812 COUT2 100uF 6.3V 1812 C9 (OPT) "D" Case + VOUT 5V / 2A COUT3 1uF 6.3V 0603 E6 C 0.1uF 5 R4 0 Ohm C1 100pF 5% VOUT Q2 Si7465DP (OPT) 11 0.1uF C4 47pF 5% Q1 FDMC5614P C7 C5 4 R3 80.6K 1% R8 0 Ohm C6 C D 8 GND E8 R5 422K 1% 6 R2 10.0K 1% C2 2200pF ITH PGOOD 7 GND C8 220pF 5% 13 VIN VOUT B B R10 0 Ohm R9 100k SHDN 1 R11 (OPT) ON 2 E7 PGOOD 3 OFF JP1 CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY RB/MI DAVID B. LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY TITLE: SCHEMATIC 60V, LOW IQ , STEP-DOWN CONTROLLER SIZE N/A C:\DESIGN\17\1722A-3\1722A-3.DSN THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 DATE: 2 IC NO. REV. LTC3864EMSE DEMO CIRCUIT 1722A 05/11/12 11:55:11 3 SHEET 1 1 OF 1 A